Gabriella Pigozzi | Université Paris Dauphine - PSL (original) (raw)
Uploads
Papers by Gabriella Pigozzi
Social Choice and Welfare, Nov 28, 2016
HAL (Le Centre pour la Communication Scientifique Directe), 2008
Abstract Judgment aggregation is a recent formal discipline that studies how to aggregate individ... more Abstract Judgment aggregation is a recent formal discipline that studies how to aggregate individual judgments to form collective decisions. Examples are expert panels, legal courts, boards, and councils. The problems investigated in this new field are relevant and ...
HAL (Le Centre pour la Communication Scientifique Directe), 2018
Since multi-agent systems are inspired by human societies, they do not only borrow their coordina... more Since multi-agent systems are inspired by human societies, they do not only borrow their coordination mechanisms such as conventions and norms, but also need to consider the processes that describe how norms come about, how they propagate in the society, and how they change over time.In the NorMAS community, this is best reflected in various norm life cycle conceptions that look at normative processes from a holistic perspective. While the earliest life cycle model emerged in the research field of international relations, the first life cycle model in the AI community has been proposed at the 2009 NorMAS Dagstuhl workshop by Savarimuthu and Cranefield [2009] and is based on a comprehensive survey of then existing contributions to the research field. Subsequently, two further models have been proposed that offer more refined accounts of the fundamental underlying processes.In this article, we review all existing norm life cycle models (Section 2), including the introduction of the individual life cycle models and their contextualization with specific contributions that exemplify life cycle processes.
Annals of Mathematics and Artificial Intelligence, Sep 19, 2015
The paper presents a focused survey about the presence and the use of the concept of "preferences... more The paper presents a focused survey about the presence and the use of the concept of "preferences" in Artificial Intelligence. Preferences are a central concept for decision making and have extensively been studied in disciplines such as economy, operational research, decision analysis, psychology and philosophy. However, in the recent years it has also become an important topic both for research and applications in Computer Science and more specifically in Artificial Intelligence, in fields spanning from recommender systems to automatic planning, from non monotonic reasoning to computational social choice and algorithmic decision theory. The survey essentially covers the basics of preference modelling, the use of preference in reasoning and argumentation, the problem of compact representations of preferences, preference learning and the use of non conventional preference models based on extended logical languages. It aims at providing a general reference for all researchers both in Artificial Intelligence and Decision Analysis interested in this exciting interdisciplinary topic.
Journal of Philosophical Logic, Mar 7, 2015
Dagstuhl Seminar Proceedings, 2005
HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2015
The focus of this entry is to draw explicit connections between judgment aggregation and the beli... more The focus of this entry is to draw explicit connections between judgment aggregation and the belief merging literature. Judgment aggregation will be briefly introduced in the next section. For a more comprehensive introduction to judgment aggregation the reader is referred to (List 2013; Grossi and Pigozzi 2014).
HAL (Le Centre pour la Communication Scientifique Directe), Jun 1, 2012
A crucial problem in the design of multi-issue group decisions is the definition of rules that se... more A crucial problem in the design of multi-issue group decisions is the definition of rules that select outputs that are consistent with existing correlations between multiple issues. A less known problem arises when the collective outcome is supported by none or by the fewest individuals, bringing into question the compatibility of a collective decision with respect to individual choices. The aim of this paper is to make a first step into providing a definition of compatible outcome for binary aggregation procedures. We provide several definitions of compatibility, both for complete binary ballots and for the more general case of allowing abstentions in the individual judgments. We define a number of rules that draw inspiration from the literature on argumentation theory, social choice theory and belief merging, and for each of these rules we investigate their behaviour with respect to compatibility and consistency, and we study their social choice theoretic properties.
HAL (Le Centre pour la Communication Scientifique Directe), Jun 22, 2022
HAL (Le Centre pour la Communication Scientifique Directe), Jul 13, 2022
HAL (Le Centre pour la Communication Scientifique Directe), Jun 30, 2020
IfColog journal of logics and their applications (FLAP), 2018
In this article, we propose an agent-based model of opinion diffusion and voting where agents inf... more In this article, we propose an agent-based model of opinion diffusion and voting where agents influence each other through deliberation. The model is inspired from social modeling as it describes a process of collective decision-making that iterates on a series of dyadic inter-individual influence steps and collective deliberation procedures. We study the evolution of opinions and the correctness of decisions taken within a group. We also aim at founding a comprehensive model to describe collective decision-making as a combination of two different paradigms: argumentation theory and agent-based influence models, which are not obvious to link since a formal translation and interpretation of their relationship is required. From a sequence of controlled simulations, we find that deliberation, modeled as an exchange of arguments, reduces the variance of opinions and the number of extremists, as long as not too much deliberation takes place during the decision-making process. Insofar as ...
Social Choice and Welfare, Nov 28, 2016
HAL (Le Centre pour la Communication Scientifique Directe), 2008
Abstract Judgment aggregation is a recent formal discipline that studies how to aggregate individ... more Abstract Judgment aggregation is a recent formal discipline that studies how to aggregate individual judgments to form collective decisions. Examples are expert panels, legal courts, boards, and councils. The problems investigated in this new field are relevant and ...
HAL (Le Centre pour la Communication Scientifique Directe), 2018
Since multi-agent systems are inspired by human societies, they do not only borrow their coordina... more Since multi-agent systems are inspired by human societies, they do not only borrow their coordination mechanisms such as conventions and norms, but also need to consider the processes that describe how norms come about, how they propagate in the society, and how they change over time.In the NorMAS community, this is best reflected in various norm life cycle conceptions that look at normative processes from a holistic perspective. While the earliest life cycle model emerged in the research field of international relations, the first life cycle model in the AI community has been proposed at the 2009 NorMAS Dagstuhl workshop by Savarimuthu and Cranefield [2009] and is based on a comprehensive survey of then existing contributions to the research field. Subsequently, two further models have been proposed that offer more refined accounts of the fundamental underlying processes.In this article, we review all existing norm life cycle models (Section 2), including the introduction of the individual life cycle models and their contextualization with specific contributions that exemplify life cycle processes.
Annals of Mathematics and Artificial Intelligence, Sep 19, 2015
The paper presents a focused survey about the presence and the use of the concept of "preferences... more The paper presents a focused survey about the presence and the use of the concept of "preferences" in Artificial Intelligence. Preferences are a central concept for decision making and have extensively been studied in disciplines such as economy, operational research, decision analysis, psychology and philosophy. However, in the recent years it has also become an important topic both for research and applications in Computer Science and more specifically in Artificial Intelligence, in fields spanning from recommender systems to automatic planning, from non monotonic reasoning to computational social choice and algorithmic decision theory. The survey essentially covers the basics of preference modelling, the use of preference in reasoning and argumentation, the problem of compact representations of preferences, preference learning and the use of non conventional preference models based on extended logical languages. It aims at providing a general reference for all researchers both in Artificial Intelligence and Decision Analysis interested in this exciting interdisciplinary topic.
Journal of Philosophical Logic, Mar 7, 2015
Dagstuhl Seminar Proceedings, 2005
HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2015
The focus of this entry is to draw explicit connections between judgment aggregation and the beli... more The focus of this entry is to draw explicit connections between judgment aggregation and the belief merging literature. Judgment aggregation will be briefly introduced in the next section. For a more comprehensive introduction to judgment aggregation the reader is referred to (List 2013; Grossi and Pigozzi 2014).
HAL (Le Centre pour la Communication Scientifique Directe), Jun 1, 2012
A crucial problem in the design of multi-issue group decisions is the definition of rules that se... more A crucial problem in the design of multi-issue group decisions is the definition of rules that select outputs that are consistent with existing correlations between multiple issues. A less known problem arises when the collective outcome is supported by none or by the fewest individuals, bringing into question the compatibility of a collective decision with respect to individual choices. The aim of this paper is to make a first step into providing a definition of compatible outcome for binary aggregation procedures. We provide several definitions of compatibility, both for complete binary ballots and for the more general case of allowing abstentions in the individual judgments. We define a number of rules that draw inspiration from the literature on argumentation theory, social choice theory and belief merging, and for each of these rules we investigate their behaviour with respect to compatibility and consistency, and we study their social choice theoretic properties.
HAL (Le Centre pour la Communication Scientifique Directe), Jun 22, 2022
HAL (Le Centre pour la Communication Scientifique Directe), Jul 13, 2022
HAL (Le Centre pour la Communication Scientifique Directe), Jun 30, 2020
IfColog journal of logics and their applications (FLAP), 2018
In this article, we propose an agent-based model of opinion diffusion and voting where agents inf... more In this article, we propose an agent-based model of opinion diffusion and voting where agents influence each other through deliberation. The model is inspired from social modeling as it describes a process of collective decision-making that iterates on a series of dyadic inter-individual influence steps and collective deliberation procedures. We study the evolution of opinions and the correctness of decisions taken within a group. We also aim at founding a comprehensive model to describe collective decision-making as a combination of two different paradigms: argumentation theory and agent-based influence models, which are not obvious to link since a formal translation and interpretation of their relationship is required. From a sequence of controlled simulations, we find that deliberation, modeled as an exchange of arguments, reduces the variance of opinions and the number of extremists, as long as not too much deliberation takes place during the decision-making process. Insofar as ...